Questions about antenna modelling in lumped circuit

We model the Antenna in lumped circuit as attachment.
The left-hand side is the antenna which consists of radiation resistance, recatance,
and a voltage source. The right-hand side in the schematic is the loading resistor.

I have several questions as following.
1) Is it ok to model the signal received from antenna with a voltage source?

2) Is the voltage of voltage source is different once if the loading resistor is changed?
I mean the amplitude of received signal is different with different loading resistor.

3)Or, the radiation resistance will vary with the different loading resistor?

Thank you,

I might get an idea how to describe my question. Is the available power from antenna is different with the different load?

For example, the available power from antenna is 0dBm in 50ohms system.
We load it with one 10ohms or 100ohms, is the available power different in
the two cases?

Look at https://www.edaboard.com/viewtopic.php?t=115007

and https://www.edaboard.com/viewtopic.php?t=62139

and https://www.edaboard.com/viewtopic.php?t=143048

RGZ

PL

The power will be identical.

Hi plasma,

I have read all the links, but I'm not sure I really realize what you want to tell
me. I feel all the links didn't answer my question.
Would you answer me in accordance with my question directly?
Thanks,